I am in full agreement with you on everything here. Especially the last part: my belief that Knox and Sollecito should be acquitted is absolutely definitely not set in stone, and I'd change my view in an instant if there was solid evidence proving their participation in the murder.
I've mentioned it before, but I think that the two things that are now the most urgent matters for the defence to address are these: the bathmat partial foot print, and the testimony of Quintavalle. I believe that if Hellmann's court comes to the same conclusions about these two things as Massei's court did (i.e. the print was Sollecito's, and Quintavalle's testimony was accurate and reliable), then Knox/Sollecito will be found guilty - regardless of the exclusion of the DNA evidence and even if ToD is shown to be pre-10pm.
My objective belief is that the footprint analysis was based entirely on bogus pseudoscience, done by a police forensics analyst who was working to an agenda. I think that there is more than ample scope for the defence to completely refute this evidence. I think the defence teams did a very bad job in not giving a sufficiently convincing rebuttal in the first trial (although Massei's dreadful reasoning in this area also contributed). I hope (and believe) that in the appeal trial, the defence will home in on this bathmat partial print, and focus on destroying it as incriminating evidence. After all, if they don't manage to successfully contest this print, then the court will conclude that Sollecito was barefoot in the bathroom at some point, having stepped in a dilute mixture of Meredith's blood. That would be enough - in my view - to show guilt on Sollecito's part (and, by extension, probably Knox's too), especially when set against his claims regarding his whereabouts and footwear on the 1st/2nd November.
On Quintavalle's testimony, I believe that he is either honestly mistaken or a liar. Again, I don't think the defence teams did enough in the first trial to question the validity or veracity of this testimony (coupled, again, with awful reasoning on Massei's part). But I think it should be fairly easy to cast significant doubt on his story*. The whole way in which it came to light, and the way in which it seems to conflict with his own employee's recollection, makes it a highly unreliable piece of testimony to me. But again, if the defence can't cast significant doubt on Quintavalle, then my belief is that Knox would be in trouble: why would she lie about her whereabouts at 7.45-8.00am on the 2nd, unless she had something major to hide?
* Although it's hard to fight against the sort of stellar "reasoning" used by Massei (and explicitly explained in his discussion of Capezzali's testimony), in which he couldn't figure why somebody would testify to something happening if it hadn't actually happened......